Optical studies of the interaction of 4?-6-diamidino-2-phenylindole with DNA and metaphase chromosomes
ChromosomaPublished 1 January 1977
Ming S. Lin, David E. Comings, O.S. Alfi
Citations166
SJR quartileQ2
SJR score1.01
SNIP0.53
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TL;DR
The optical absorption and fluorescence characteristics of 4′-6-diamidino-2-phenylindole with DNA and chromosomes were studied and it was found that this dye may be useful for identifying A-T rich region in chromosomes.
Abstract
The optical absorption and fluorescence characteristics of 4'-6-diamidino-2-phenylindole (DAPI) with DNA and chromosomes were studied. There is a decrease in extinction coefficient and chift in the absorption spectra to a higher wavelength when the dye binds to DNA. The fluorescence of DAPI is enhanced by both A-T and G-C base-pairs. The enhancement by A-T rich is significantly greater than by G-C rich DNA. The chromosomes and the constrictions of human chromosomes 1 and 16; these regions are known to contain A-T rich DNA and show dull fluorescence when treated with quinacrine. This dye may be useful for identifying A-T rich region in chromosomes. The fluorescence of DAPI bound to polynucleotides or chromosomes is partially quenched by the introduction of BrdU. This suppression of dye fluorescence allows optical detection of sister chromatid exchanges and chromosome region containing DNA with an unequal distribution of thymidine between polynucleotide chains after BrdU incorporation.
Keywords
ChemistryMedicineBiochemistry, Genetics and Molecular Biology
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